Data: components 069-080

statistic.go

@@ -0,0 +1,113 @@
+package mujica
+
+import (
+	"math"
+	"strconv"
+	"strings"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/icons"
+	"mujicaui/theme"
+)
+
+// StatisticOptions configure a Statistic. It formats values; it computes none.
+type StatisticOptions struct {
+	Title string
+	// Precision is the number of decimals, 0 or more.
+	Precision int
+	// Prefix and Suffix wrap the number, as "$" or "×"; Unit follows it, smaller.
+	Prefix, Suffix, Unit string
+	// Format replaces the built-in grouped decimal formatting.
+	Format func(v float64) string
+	// Change, when set, shows the caller's change with a sign and an arrow.
+	Change     *float64
+	ChangeUnit string
+	// ChangeNote explains the change, as "vs last week".
+	ChangeNote string
+}
+
+// Statistic shows a headline number with its title, unit and change.
+func Statistic(c *ui.Context, value float64, opts StatisticOptions) *ui.Element {
+	if opts.Precision < 0 {
+		panic("mujica: Statistic with negative Precision")
+	}
+	k := Tokens(c)
+	u := Density(c).Unit()
+	format := opts.Format
+	if format == nil {
+		format = func(v float64) string { return statisticFormat(v, opts.Precision) }
+	}
+	num := opts.Prefix + format(value) + opts.Suffix
+	spoken := strings.TrimSpace(opts.Title + " " + num + " " + opts.Unit)
+	e := ui.Column(c).Gap(u).Role(ui.RoleGroup)
+	e.Children(func() {
+		if opts.Title != "" {
+			ui.Text(c, opts.Title).FontSize(theme.CaptionSize).TextColor(k.TextMuted)
+		}
+		ui.Row(c).Gap(u).AlignItems(ui.End).Children(func() {
+			ui.Text(c, num).Font(theme.SerifFont).FontSize(theme.H1Size).FontWeight(600).LineHeight(1.2).SingleLine()
+			if opts.Unit != "" {
+				ui.Text(c, opts.Unit).TextColor(k.TextMuted).Padding(0, 0, u, 0)
+			}
+		})
+		if opts.Change == nil {
+			return
+		}
+		ch := *opts.Change
+		col, icon, word := k.TextMuted, "minus", msg(c, "statistic.flat")
+		switch {
+		case ch > 0:
+			col, icon, word = k.Success, "arrow-up", msg(c, "statistic.up")
+		case ch < 0:
+			col, icon, word = k.Danger, "arrow-down", msg(c, "statistic.down")
+		}
+		text := statisticSigned(ch, opts.Precision) + opts.ChangeUnit
+		spoken += ", " + word + " " + text
+		ui.Row(c).Gap(u).AlignItems(ui.Center).Wrap().Children(func() {
+			ui.Row(c).Gap(u / 2).AlignItems(ui.Center).TextColor(col).Children(func() {
+				ui.Icon(c, icons.Must(icon)).Size(14, 14)
+				ui.Text(c, text).FontWeight(600).SingleLine()
+			})
+			if opts.ChangeNote != "" {
+				ui.Text(c, opts.ChangeNote).FontSize(theme.CaptionSize).TextColor(k.TextMuted)
+			}
+		})
+	})
+	return e.Label(spoken)
+}
+
+// statisticFormat writes v with p decimals and comma-grouped thousands.
+func statisticFormat(v float64, p int) string {
+	if math.IsNaN(v) || math.IsInf(v, 0) {
+		return strconv.FormatFloat(v, 'f', -1, 64)
+	}
+	s := strconv.FormatFloat(math.Abs(v), 'f', p, 64)
+	whole, frac, _ := strings.Cut(s, ".")
+	var b strings.Builder
+	if v < 0 && strings.Trim(s, "0.") != "" {
+		b.WriteString("−")
+	}
+	for i, r := range whole {
+		if i > 0 && (len(whole)-i)%3 == 0 {
+			b.WriteByte(',')
+		}
+		b.WriteRune(r)
+	}
+	if frac != "" {
+		b.WriteString("." + frac)
+	}
+	return b.String()
+}
+
+// statisticSigned writes a change with an explicit sign.
+func statisticSigned(v float64, p int) string {
+	s := statisticFormat(math.Abs(v), p)
+	switch {
+	case v > 0:
+		return "+" + s
+	case v < 0:
+		return "−" + s
+	}
+	return s
+}